Skipping out on Liberal Arts courses isn't a big deal. In fact, if you have AP or transfer credit, use it to your advantage! A number of students take courses through community college over the summer to either open up more space for extra electives or to give themselves more time to work during the school year.
Transfering credit for CORE classes... I'm not sure how I feel about this. If you don't feel like you have a strong enough foundation, you should take the courses. I transferred out of drawing my freshman year, and I got to take a painting class instead. I learned a lot more in my painting class than I would have with the drawing course. It's completely based upon the individual.